so i have a light that needs to move every time my plants come close to it but i am not sure what sensor is the best to detect if something has come close to the light.
i was thinking something like a laser that draws a line beneath the light and when the plant breaks it i activate the motors.
but i dont know of any laser beam that has a wide beam only "straight lights"
Hi,
What are you growing that needs to have an automatic lamp height system?
Because of the way plants grow, I would assume that you will need to scan an area.
What is called a light curtain would do the job.
An array of lasers and sensors.
You would only need to power up the curtain once or twice a day for only a few seconds, it would not require constant monitoring.
Tom.... 
Tom, I don't know what he's growing but I hope he isn't going to smoke it. As you always say, if you let the smoke out, it stops running... (Ok, so I have a weird sense of Humor)
Back to the subject, wouldn't a simple range finder work on a plant leaf? I don't see why it wouldn't be sensitive enough... unless the leafs are like Millimeter sized.
I like the range finder i hope I can remove all the false positive detections.
its gonna be an universal grow room but i doubt any leaf is mm sized
could you recommend what kind of motor i could use to rise the lamp?
could you recommend what kind of motor i could use to rise the lamp?
One that can move the lamp faster than the plants can grow?